Photographic system and novel compounds

Abstract

Compounds which include a quaternary group connected to a pyrimidine residue through a linkage are disclosed. These compounds are useful as silver halide solvents in photographic products, processes and compositions.

What is claimed is: 
     
       1. A photographic product comprising a support, a silver halide emulsion carried on said support and a compound represented by the formula ##STR11## wherein X is nitrogen or phosphorus; B is a divalent linking group; R and R 2  are independently selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, aryl, aralkyl and alkaryl; R 1  is selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, aryl, aralkyl, alkaryl and a divalent linking group; or at least two of R, R 1  and R 2 , together with X, form a substituted or unsubstituted heterocyclic ring; R 3  is selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl, nitro and halogen; Z is a photographically acceptable anion; and n is 1 or 2. 
     
     
       2. A photographic product as defined in claim 1 wherein X is nitrogen. 
     
     
       3. A photographic product as defined in claim 2 wherein R, R 1  and R 2 , together with X, form a ##STR12## group. 
     
     
       4. A photographic product as defined in claim 3 wherein B is methylene. 
     
     
       5. A photographic product as defined in claim 4 wherein R 3  is hydrogen and n is 1. 
     
     
       6. A photographic product as defined in claim 2 wherein R, R 1  and R 2 , together with X, form a ##STR13## group, B is methylene, R 3  is hydrogen and n is 1. 
     
     
       7. A photographic product as defined in claim 1 wherein said compound is represented by the formula ##STR14## 
     
     
       8. A photographic product as defined in claim 7 wherein R, R 1  and R 2 , together with X, form a ##STR15## group, B is methylene and n is 1. 
     
     
       9. A photographic product as defined in claim 7 wherein R, R 1  and R 2 , together with X, form a ##STR16## group, B is methylene and n is 1. 
     
     
       10. A diffusion transfer photographic process comprising: (1) reacting exposed silver halide of an imagewise exposed photosensitive silver halide emulsion layer carried on a support with a silver halide developing agent in aqueous alkaline solution;   (2) reacting unreduced silver halide of said photosensitive emulsion with a compound represented by the formula ##STR17## wherein X is nitrogen or phosphorus; B is a divalent linking group; R and R 2  are independently selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, aryl, aralkyl and alkaryl; R 1  is selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, aryl, aralkyl, alkaryl and a divalent linking group; or at least two of R, R 1  and R 2 , together with X, form a substituted or unsubstituted heterocyclic ring; R 3  is selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl, nitro and halogen; Z is a photographically acceptable anion; and n is 1 or 2; said compound being capable of reacting with silver halide to form a complex silver salt that is soluble in said alkaline solution;   (3) transferring said complex silver salt to a superposed image-receiving layer; and   (4) reducing said transferred complex silver salt to provide a silver image.   
     
     
       11. The process as defined in claim 10 wherein X is nitrogen. 
     
     
       12. The process as defined in claim 11 wherein R, R 1  and R 2 , together with X, form a ##STR18## group. 
     
     
       13. The process as defined in claim 12 wherein B is methylene. 
     
     
       14. The process as defined in claim 13 wherein R 3  is hydrogen and n is 1. 
     
     
       15. The process as defined in claim 11 wherein R, R 1  and R 2 , together with X, form a ##STR19## group, B is methylene, R 3  is hydrogen and n is 1. 
     
     
       16. The process as defined in claim 10 wherein said compound is represented by the formula ##STR20## 
     
     
       17. The process as defined in claim 16 wherein R, R 1  and R 2 , together with X, form a ##STR21## group, B is methylene and n is 1. 
     
     
       18. The process as defined in claim 16 wherein R, R 1  and R 2 , together with X, form a ##STR22## group, B is methylene and n is 1. 
     
     
       19. A photographic processing composition comprising an aqueous alkaline solution containing a viscosity-increasing polymer and at least one compound represented by the formula ##STR23## wherein X is nitrogen; B is methylene; R, R 1  and R 2 , together with X, form a ##STR24## group; R 3  is selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl, nitro and halogen; Z is a photographically acceptable anion; and n is 1 or 2. 
     
     
       20. A composition as defined in claim 19 wherein R 3  is hydrogen and n is 1. 
     
     
       21. A photographic processing composition comprising an aqueous alkaline solution containing a viscosity-increasing polymer and at least one compound represented by the formula ##STR25## wherein X is nitrogen; B is methylene; R, R 1  and R 2 , together with X, form a ##STR26## group; R 3  is hydrogen; Z is a photographically acceptable anion; and n is 1. 
     
     
       22. A photographic processing composition comprising an aqueous alkaline solution containing a viscosity-increasing polymer and at least one compound represented by the formula ##STR27## wherein X is nitrogen or phosphorous; B is a divalent linking group; R and R 2  are independently selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, aryl, aralkyl and alkaryl; R 1  is selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, aryl, aralkyl, alkaryl and a divalent linking group; or at least two of R, R 1  and R 2 , together with X, form a substituted or unsubstituted heterocyclic ring; R 3  is selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl, nitro and halogen; Z is a photographically acceptable anion; and n is 1 or 2. 
     
     
       23. A composition as defined in claim 22 wherein R, R 1  and R 2 , together with X, form a ##STR28## group, B is methylene and n is 1. 
     
     
       24. A composition as defined in claim 22 wherein R, R 1  and R 2 , together with X, form a ##STR29## group, B is methylene and n is 1.